Extreme Programming (XP) is an agile software-development methodology that emphasises short iterations, continuous feedback, and engineering discipline to deliver high-quality software responsive to changing requirements. Its core practices include test-driven development, pair programming, continuous integration, collective code ownership, and frequent small releases. XP treats good practices to an ‘extreme’ degree, for example applying continuous code review through constant pairing.
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- XP organises work into short iterations driven by user stories, mandating test-first development, continuous integration, and on-site customer collaboration. The methodology trades upfront design documentation for evolutionary design and refactoring, relying on automated tests and pairing to keep defect rates low while accommodating volatile requirements.